5.3 TOTAL HEAD

Each term of the Bernoulli’s equation represent the dimension of length i.e., in 5.1. it is meter. Left hand side i.e.,(p / p g + v² / 2 g + z) is called the total head.

5.4 VELOCITY HEAD

In equation (5.3), v is the velocity and ( v² / 2 g) is called the velocity head.

5.5 PRESSURE HEAD

In equation (5.3), p is the pressure and (:g ) is called the pressure head.

5.6 DATUM OR POTENTIAL HEAD

In equation (5.3), z is called the datum head or potential head.

Note : All the head is nothing but energy per unit weight.

5.7 ASSUMPTIONS MADE FOR DERIVING BERNOULLI’S EQUATION

Following are some Assumptions made for deriving Bernoulli’s equation:

(i) The flow is incompressible.

(ii) The flow is steady.

(iii) The fluid is non viscous (µ. = 0)

(iv) The flow is irrotational.